Stamp-mill



No. 6|4,483. Patented Nov. 22, I898. A. G. MA-THER &.,F. T. SNYDER.

S T A M P M l L L A' nmei n filed July 29, 1897.)

4 Sheets-Sheet I.

(No Model) WWW/9W Rs co, PNDYO-LITHOu wAsmNc 4 Sheets-Sheet 3.

Patented Nov. 22, I898. A. G. MATHER & F. T. SNYDER.

STAMP MILL 8 and, J W Humanem Ill E w (Application filed July 29, 1897.)

/7 1,19. i\\ g Iil IIII 3 8 1 4 M II 6 0 M 0 0 N W No. 614,483. PatentedNov. 22, I898. A. G. MATHEB & F. T.'SNYDEB.

STAMP MILL.

{Application filed July 29, 1897.)

4 Sheets-Sheet 4.

(No Model.)

v 25mm u.. WASH! I UNITED STATES PATENT GEEICE.

ALLAN G. MATHER AND FREDERICK T. SNYDER, OF MILWAUKEE, WISCONSIN.

STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 614,483, dated November22, 1898.

I Application filed July 29,1897. Serial No. 646,284. (No model.)

To all whom it may concern:

Be it known that we, ALLAN G. MATHER and FREDERICK T. SNYDER, ofMilwaukee, in the county of Milwaukee and State of W'isconsin, haveinvented new and useful Improvements in Stamp-Mills, of which thefollowing is a description, reference being had to the accompanyingdrawings, which are a part of this specification.

Ourinvention has relation to improvements in stamp-mills of that classparticularly designed for crushing and pulverizing ores carryingvaluable minerals,which require crushing and pulverizing to facilitatethe extraction. of the valuable mineral from the gangue or rock.

Among the objects of our invention are, first, to provide improved meansfor preventing the splash from passing up into the space between thestamp-stems and the bordering edges of the openings of the housing;second, to provide improved means for securing an even and automaticfeed of the material; third, to provide a construction adapted toprevent uneven wear on the shoe, and, fourth, the invention furthermorecomprehends a machine of minimum Weight and capable of crushing themaximum amount of ore with the least expenditure of plant and with theleast power.

With the above primaryand other incidental objects in view the inventionconsists of the devices and parts or their equivalents, as hereinaftermore fully set forth.

In the accompanying drawings, Figure 1 is a front elevation of themachine, the screens being removed from their frames. Fig. 2 is anelevation at right angles to Fig. 1. Fig. 3 is a vertical sectionalview. Fig. 4 is a sectional View of the feed-spout. Fig. 5 is a planview of Fig. 8, parts in section. Fig. 6 is a plan view of thestamp-revolving device, and Fig. 7 shows a modification in the means foractuating the tubular stamp-stems.

Referring to the drawings, the numeral 12 indicates the base. Above thebase is formed the stamp-box 18, preferably of square or rectangularshape. This stamp-box has four open metallic side frames 141 and acentrallyapertured top piece 15. To the openings of the side frames areadjusted screen-frames 16. Screens are therefore arranged on all foursides, which provides for the pulp being forced out of the mortar in thequickest possible time. These screen-frames are held in place byvertical wedge-keys 17, which are forced down between the inner sides ofthe metallic frames and the outer sides of the screen-frames. For moresecurely retaining the screen-frames in place upwardly-extending lugs 18may be cast on the upper side of the base 12 and horizontal wedge-keys19 forced between these lugs and the lower strips of the screen-frames.

The top surface of the base 12 forms the bottom of the stan1p-box, andthis top surface is provided with a recess having sloping side Walls,which walls, together with the flat bottom of the recess, form themortar 20, in which mortar are located the dies 20. The sloping sidewalls are provided with metallic linings 21, which at their upper edgesare turned over the tops of the sloping walls and are provided at theirouter edges with depending lips 22, which engage against shoulders 23,formed on the upper surface of the base 12. Wedges are employed forholding the linings in place. These wedges are indicated by the numerals24. and are passed between the lowerportions of the lugs l8,hereinbeforereferred to, and the outer edges of the upper portions of the linings.The linings therefore are held in place by wedges arranged outside ofthe mortar. The outer edges of the linings are also cut out, asindicated at 25, to form seats for the lower strips of thescreen-frames.

The numeral 26 indicates the feed-spout, which forms a part of thecasting and extends through the top of the stamp-box, and its wallWithin the stamp-box is inclined inwardly, so as to direct the materialto the bottom or die of the mortar. A removable chute or trough 27 leadsto the feed-spout.

The stamp-stems 28 of our improved mill are made tubular or hollow. Thistubular formation enables a stamp-stem to be used of the maximumdiameter and at the same time of very'light weight as compared to asolid stem of the same diameter. A solid stem of the maximum diametercould not be successfully used, owing to the great weight it would addto the machine. vantage gained by the employment of a tubular stamp-stemresides in the increased stiffness and strength thereby secured. WVehave shown two of these stamp-stems in the accompanying illustration ofour invention; but a greater number may be employed if found necessaryor convenient. To the lower ends of the stems are secured the shoes 29,which are of the usual form and are adapted to act alternately on thedies within the mortar.

The top piece of the stamp-box is provided with the flan ged portion andwith the horizontal portion 31, extending from the lower edge of theflange 30. The openings in the top 15 are formed in this horizontalportion, and said horizontal portion provides a ledge for supporting ahousing 32, said housing being in the nature of a block, advisably ofwood, and having openings therethrough for the passage of thestamp-stems. This housing is of considerable thickness, so that it isimpossible on the downstroke of the stamp-stems for any splash to passup into the space between said stamp-stems and the edges of the openingsof the housing. In other words, the splash would not have time in theperiod consumed by the descent of a stampstem to travel upwardly adistance equal to that of the thickness of the housing. 0f course thesame object could be obtained by extending the top of the stamp-boxupwardly a greater distance and employing at that point a housing ofless thickness. This necessitates, however, the extension of thevertical height of the machine, which of course, from economical andother standpoints, is to be avoided. We therefore accomplish the objectdesired-that is, the preventing of the upsplashing material from passingupwardly out of the box through the space between the housing and thestampstem-by constructing said housing much thicker than has heretoforebeen the practice and arranging it ata lowerpoint of the frame, wherebywe are enabled to employ a frame of minimum height and at the same timeavoid the objectionable splashing referred to. For holding the housingin place we prefer to employ horizontal wedge-keys 32, which engageregistering recesses in the flanges 30 and the outer edges of thehousing. These horizontal keys are an improvement over verticalwedge-keys, owing to the liability of the latter working out of place,and said horizontal wedge-keys also prevent the housing from working upby the friction of the stampstems.

The bordering edges of the openings of the. housing do not fit closelyto the stamp-stems; but a slight space 33 is left therebetween. Thisspace leads to and communicates with annular grooves 34, formed in theedges of the openings of the housing.

The numerals 35 35 indicate the water-supply pipes, which lead from anysuitable source A further point of adof water-supply and connect attheir inner ends with vertical valve-controlled waterpipes 36 36. Thesepipes 36, at their lower ends, extend through the casting andcommunicate with the annular grooves 34. The water therefore isconducted to these annular grooves andfrom thence passes down betweenthe stems and the edges of the openings of the housing into thestamp-box. The water thus passing into the stamp-box is used for thepurpose of washing the finely-crushed pulp out through the screens, andit also serves incident-ally the purpose of washing off any sand whichmight travel up and adhere to the stems, thereby always keeping thestems free from clogging accumulations.

The mechanism for securing an even distribution of the material will nowbe described. Within the feed-spout is a fixed pin 37. This pin hasmounted freely thereon a sleeve 38. The pin and sleeve project throughthe inner wall of the feed-spout to a position just above the housing,and the inner projecting end of the sleeve is provided with theobliquely-extending arms 39 39, the extremities of said arms beingadjacent to the stampstems. Mounted on each stamp-stem is a collar 40.Each collar is preferably secured to its stem by means of a curvedwedge-key 41 entering a curved slot 42 in the collar. (See Fig. 5.)Within the feed-spout and disposed about centrally thereof is a curvedhorizontal partition 43. This partition is removable and is held inposition by horizontal wedges 43. This partition does not extendentirely across the spout, so that side passages 44 44 are left, whichlead to the discharge-opening of the spout. At its upper edge the spoutis divided by partitions 45 45 into three inlet-spaces. The sleeve isprovided upon its under side with a depending wing 46, which is locatedabove the center of the partition 43. Ordinarily the material is fedthrough the central passage between the partitions 45 45 and isdeposited upon the curved partition 43. As the stamp-stems alternatelyreciprocate vertically, the collars 40 thereon alternately en gage theobliquely-extendin g arms 39, whereby the sleeve 33 is caused to berocked and the depending wing thereof oscillated. This m ovement of thewing will cause the material deposited on the partition 43 to be actedupon and to be evenly distributed and forced through the passages 44 tothe discharge-opening of the spout. By this method it is obvious that anautomatic and even distribution of the feed is obtained, as if but asmall quantity of material is in the mortar the drop of the stamp-stemis necessarily greater, and consequently the oscillation of thedepending wing is correspondingly increased and the feed of the materialthereby augmented.

The upper ends of the stamp-stems 28 are herein shown as fitting incylinders 47 47. In these cylinders steam is adapted to be admittedalternately below and above the ends of the stamp-stems at the propertime for IIO causing the up and down movements of said stamp-stems. Wedo not, however, wish to be understood as restricting ourselves to theuse of steam as the actuating medium, as it is obvious that any othersuitable fluid-actuating agent may be employed; or, for that matter, thestamp-stems may be alternately reciprocated by suitable mechanicalmeans, as hereinafter pointed out. These cylinders are supported bymeans of vertical. rods or standards 48. The lower ends of these rods orstandards pass into sockets 49, formed in the outer extremities of arms50, projecting outwardly from the base 12. The rods or standards arepreferably secured in the sockets by means of wedge-keys 51. These rodsalso pass through sleeves 52, forming part of the top casting of thestamp-box, and their upper converging ends pass through sleeves 53,formed at the lower ends of the, cylinders. The upper extremities of therods project above the upper ends of these sleeves and are threaded toreceive jam -nuts 54. The tubular stamp-stems pass into the cylinder andtheir upper closed ends form pistons or heads. These upper ends of thetubular stems are preferably closed by means of screw-caps 55, the outerannular flanges of said caps bearing against the inner sides of thecylinders. The upper sides of the caps form the surface against whichthe steam acts to cause the descent of the stamp-stems, while the underedge 56 of the annular flanges .of the screw-caps form the surfaceagainst which the steam acts to cause the up movement of thestamp-stems.

Heretofore in this class of devices considerable difficulty has beenexperienced from the liability of the shoe wearing unevenly on its underacting surface, owing to its constant contacting with the die. Toobviate this difficulty, we provide a construction whereby on each upmovement of the stampstem said stem is compelled to partly rotate, withthe result that different portions of the surface of the shoe arepresented to the fixed surface of the die on each successive contact.This mechanism is shown most clearly in Figs. 3 and 6 of the drawings.At the top of each steam-cylinder we provide a horizontal partition 87.Arranged between this partition and the cap-piece 88 of the cylinder isa disk 89. This disk is provided with a depending stem 90, which isformed with a series of longitudinal twists, as clearly shown. The stempasses through a central nut 91 in the top of piston 55 of thestamp-stem and extends down into a tube 92, said tube having a closedlower end whereby steam from the top of the cylinder is prevented frompassinginto the bore of the tubular shaft. The nut 91 is provided withgrooves which receive the twists of the stem. The disk 89 is formedperipherally with a series of recesses 93. These recesses form spacesbetween their edges and the annular flange 94, extending upwardly fromthe partition 87.

In each of these spaces is arranged a roller 95. The inner edge of eachrecess 93, at one end, inclines outwardly, so that the space between theinner edge of each recess and the annular flange 94 is narrower at oneend than at the other. On the up movement of the stamp-stem the groovesin the nut 91, which grooves are engaged by the twists of the stem 90,will cause said stem and its disk 89 to be slightly turned, so as towedge the rollers 95 in the narrowest portions of the spaces formed bythe recesses 93 and the annular flange 94. This will have the effect ofholding the disk 89 and its stem 90 rigid, and with the continued upmovement of the stampstem said stamp-stem will be partially revolved. Onthe down movement of the stampstem, however, a slight initial turn isgiven to the disk 89, which releases the wedging action between therollers and the surfaces between which said rollers are confined andpermits the rollers to pass into the widest portions of the recesses andallow for free rotation of the disk and its stem. The result is that onthe downstroke the stamp-stem will drop without any rotation whateverbeing imparted thereto. From this it will be seen that on each upstrokea partial turn is given to the stamp-stem, so that on the followingdownstroke a new surface is presented to the die. WVhile we have shownthis mechanism in connection with a stamp-stem adapted to be actuated bysteam-pressure and a part of this mechanism disposed in the upperportion of the steam-cylinder, yet we do not wish to be understood aslimiting ourselves to this particular adaptation of the mechanism,inasmuch as it is obvious that the mechanism may be used in connectionwith a stamp-stem reciprocated by any other desired means, it being onlynecessary that the wedging-disk 89 be so arranged as to provide thespaces for the rollers 95.

In Fig. 11 we have shown the stem as provided with a collar 96, saidcollar adapted to be acted upon by the cam-arms 97 97, mounted on ashaft 98.

In Fig. 3, 99 99 indicate amalgamated plates suspended inside thestamp-box 13 by keys 100 100. These plates 99 99 are supported alongtheir upper edges by being clamped between the top rails of thescreenframes 16 16 and the outer edges of the top 15 of the stamp-box13. It is customary to place these plates in the lower portion of thestamp-box. This unavoidably obstructed the screen discharge on the sidewhere they are located. By placing them, as shown, in the top of thestamp-box adjacent to and inclined inwardly from the top edge of thescreen the pulp, as it splashes up against the screen, washes over theplates and the precious metal amalgamated and is retained in the plates.

What we claim as our invention is- 1. In a stamp-mill, the combination,of a stamp-box, a top piece therefor, said top piece having an openingtherethrough, and a vertical flange surrounding said opening, the loweredge of said flange formed with an inwardly-extendinghorizontalflange,ahousing seated on the horizontal flange of the top piece, horizontalwedge-keys fitting in registering recesses in the vertical flange of thetop piece 'over the top edge of said chamber, and provided with adepending lip engaging a shoulder in the top of the base, and horizontalwedge-keys passing between the upwardlyextending lugs and the outeredges of the lining.

3. In a stamp-mill, the combination, of a base having a recess in itstop surface formin g a mortar-chamber, a lining for the mortarchamber,said lining extending over the top edge of said chamber, and providedwith a cut-away portion forming a seat, a stamp-box above the base andprovided with open sides, and screens adjustable to said open sides, thelower edges of the screens fitting the seats formed by the cut-awayportion of the lining.

4. In a stamp-mill, the combination, of a stamp-box, a stationaryfeed-spout leading thereto, said feed-spout provided interiorly with astationary horizontal partition extending partly thereacross and leavingpassageways at its ends leading to the dischargeopening of the spout, arocking part within the feed-spout, said rocking part provided with adepending wing located above the horizontal partition, and said rockingpart also provided with a projecting arm, and a stamp-stem provided witha collar or projecting tappet adapted to act on the arm so as to cause arocking of the rocking part and a consequent oscillation of thedepending wing.

5. In a stamp-mill, the combination, of a stamp-box, a stationaryfeed-spout leading thereto, said feed-spout provided interiorly with astationary horizontal partition extending partly thereacross, andleaving passageways at its opposite ends leading to thedischarge-opening of the spout, a rocking part within the feedspout,said rocking part provided with a depending wing located above thehorizontal partition, and said rocking part also provided withoppositely projecting arms, and oppositely-reciprocating stampstemsprovided with collars or tappets adapted to act on the respectiveprojecting arms, and thereby effect a rocking of the rocking part, and aconsequent oscillation of the wing.

6. In a stamp-mill, the combination, of a mortar, a stamp-stem carryingat its lower end a shoe, a disk located within a closed space, said diskprovided peripherally with a series of recesses gradually tapering to aless depth toward one end, and said disk also provided with a dependingtwisted stem extending through an opening in the top of the stamp-stem,said opening having grooves to receive the twists of the disk-stem, androllers confined in the spaces between the recesses of the disks and thewall of the closed space within which the disk is located, whereby thestamp-stem is compelled to partly rotate in its up movement, and ispermitted to descend without rotation.

7. In a stamp-mill, the combination, of a mortar, a hollow or tubularstamp-stem carry ing at its lower end a shoe the upper portion of saidstamp-stem forming a piston, and said stamp-stem having a tube extendingfrom its upper end inwardly into the bore of the stampstem, the tubehaving a closed lower end, a cylinder in which the upper end of thestampstem reciprocates, means for admitting an actuating agent to thecylinder for actuating the stamp-stem, a disk located within a closedspace at the upper end of the cylinder, said disk provided peripherallywith a series of recesses, said recesses gradually tapering to a lessdepth toward one end, and said disk also provided with a dependingtwisted stem extending through an opening in the top of the stampstem,and into the interior tube of said stamp-stem the opening in the top ofthe stamp-stem having grooves therein to receive the twists of thedisk-stem, and rollers confined in the spaces between the recesses ofthe disk and the wall of the closed space within which the disk islocated.

In testimony whereof we aflix our signatures in presence of witnesses.

ALLAN Gr. MATHER. FREDERICK T. SNYDER. Witnesses:

C. T. BENEDICT, ARTHUR L. MoRsELL, JOSEPHINE FA'UST.

